The '74LVTH162245 devices are 16-bit (dual-octal) noninverting 3-state transceivers designed for low-voltage(3.3-V) VCC operation, but with the capability to provide a TTL interface to a 5-V system environment.
These devices can be used as two 8-bit transceivers or one 16-bit transceiver. The devices allow datatransmission from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at thedirection-control (DIR) input. The output-enable (OE) input can be used to disable the device so that the busesare effectively isolated.
The logic levels of the direction-control (DIR) input and the output-enable (OE) input activate either the B-portoutputs or the A-port outputs or place both output ports into the high-impedance mode. The device transmitsdata from the A bus to the B bus when the B-port outputs are activated, and from the B bus to the A bus whenthe A-port outputs are activated. The input circuitry on both A and B ports is always active and must have a logicHIGH or LOW level applied to prevent excess ICC and ICCZ.
Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of pullup or pulldownresistors with the bus-hold circuitry is not recommended.
The A-port outputs, which are designed to source or sink up to 12 mA, include equivalent 22-Ω series resistorsto reduce overshoot and undershoot.
Members of the Texas Instruments Widebus™ Family
A-Port Outputs Have Equivalent 22-Ω Series Resistors, So No External Resistors Are Required
Support Mixed-Mode Signal Operation (5-V Input and Output Voltages With 3.3-V VCC)
Support Unregulated Battery Operation Down to 2.7 V
Typical VOLP (Output Ground Bounce) <0.8 V at VCC = 3.3 V, TA = 25°C
Bus Hold on Data Inputs Eliminates the Need for External Pullup/Pulldown Resistors
Distributed VCC and GND Pins Minimize High-Speed Switching Noise
Flow-Through Architecture Optimizes PCB Layout
Latch-Up Performance Exceeds 500 mA Per JESD 17
ESD Protection Exceeds JESD 22 – 2000-V Human-Body Model (A114-A) – 200-V Machine Model (A115-A) – 1000-V Charged-Device Model (C101)